3. 21-hydroxylase deficiency or other enzyme deficiency leading to the phenotype of congenital adrenal hyperplasia. 21-hydroxylase deficiency will be excluded in all patients by a fasting 17-hydroxyprogesterone (17-OHP) level < 2 ng/mL. In the case of elevated fasting 17-OHP levels, an ACTH stimulation test will be performed. A 1-hour stimulated value > 10 ng/mL will be an exclusion 82. As 21 hydroxylase deficiency is a congenital condition, any normal level in the past of 17-hydroxyprogesterone allows entry into this study.